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Controlling Program Loudness in Individualized Binaural Rendering of Multichannel Audio Contents

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For practical reasons, we often experience multichannel audio productions in a binaural context (e.g., headphones on mobile devices). To make listeners benefit from optimal binaural rendering (“BiLi project”), Radio France developed nouvOson (, an online audio platform where listeners can select HRTFs and ITDs that best fit them. The goal of the present study was to control the program loudness (measured according to the ITU-R BS.1770 / R128 recommendations) after binauralization. To this end, we examined the influence of various parameters such as the audio content (synthetic vs. real broadcast audio), HRTFs, and ITDs on loudness. We propose a dynamic process, which adapts the gain in the binauralization chain so as to control the output loudness of virtual surround audio contents.

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